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Sitafloxacin (CAS 127254-12-0) is a potent, broad‑spectrum oral fluoroquinolone antibiotic with excellent activity against a wide range of Gram‑positive, Gram‑negative, and anaerobic clinical isolates, including strains resistant to other fluoroquinolones. The molecule features a unique 7‑amino‑5‑azaspiro[2.4]heptane substituent at the C7 position and a 2‑fluorocyclopropyl group at the N1 position of the quinolone core, with a molecular formula of C₁₉H₁₈ClF₂N₃O₃ and a molecular weight of 409.81 g/mol.

Eletriptan Hydrobromide (CAS 177834-92-3) is a potent, selective serotonin 5‑HT₁B and 5‑HT₁D receptor agonist used for the acute treatment of migraine headaches with or without aura. The molecule features an indole core with a (S)‑3‑((1‑methylpyrrolidin‑2‑yl)methyl) side chain and a phenylsulfonyl ethyl substituent, with a molecular formula of C₂₂H₂₇BrN₂O₂S and a molecular weight of 463.43 g/mol.

Avibactam Sodium (CAS 1192491-61-4) is a novel, covalent, and reversible non‑β‑lactam β‑lactamase inhibitor that restores the activity of β‑lactam antibiotics against resistant bacterial strains. The molecule features a unique diazabicyclooctane scaffold with a molecular formula of C₇H₁₀N₃NaO₆S and a molecular weight of 287.23 g/mol.

Albasvir (also known as Elbasvir, CAS 1370468-36-2) is a potent, directacting antiviral agent that inhibits the hepatitis C virus (HCV) nonstructural protein 5A (NS5A). The molecule features a complex macrocyclic structure with a molecular formula of C₄₉H₅₅N₉O₇ and a molecular weight of 882.02 g/mol. 

Ramelteon (CAS 196597-26-9) is a synthetic melatonin receptor agonist featuring a unique indeno-furan bicyclic scaffold fused to a propionamide side chain. The molecule is structurally derived from the endogenous hormone melatonin, with a rigid tricyclic framework that confers high affinity and selectivity for the MT₁ and MT₂ melatonin receptors.

Dronedarone (CAS 141626-36-0) is a non‑iodinated benzofuran derivative developed as a Class III antiarrhythmic agent for the management of paroxysmal and persistent atrial fibrillation. Structurally related to amiodarone, Dronedarone differs by the absence of iodine atoms, which eliminates the iodine‑associated thyroid and pulmonary toxicities that limit amiodarone’s long‑term use.